Credit: RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA/SCIENCE PHOTO LIBRARY

Caption: Electronic thermometer measuring the change of temperature during an endothermic reaction. In the beaker at centre, an electronic probe measures the temperature of a beaker of water, as potassium chloride crystals are added. Dissolving potassium chloride in water requires energy, as it takes more energy to break bonds between the potassium and chloride ions than is recovered by forming a solution of them with the water molecules. The temperature is seen to drop 24.7 degrees Celsius to 18.2, in less than 30 seconds. The energy change associated with the dissolving of a substance is called the enthalpy change of solution.

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Keywords: beaker, black background, change, changing, chemical, chemistry, compound, cool, cooling, demonstrating, demonstration, dissolution, dissolving, drop, dropping, education, educational, electronic, endothermic, energetic, energy, enthalpy change of solution, equipment, fall, falling, glassware, gloved hand, ionic, laboratory, measurement, measuring, potassium chloride, probe, reacting, reaction, salt, school, set-up, soluble, solution, solvation, temperature, thermodynamics, thermometer, water

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Endothermic reaction temperature change

K004/0789 Rights Managed

Downloadable master

Duration: 00:00:30.19

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 1.1G

Original

Capture format: Sony FS700

Codec: H.264

Interlaced: Yes

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